NEW YORK (Reuters) - A fire investigators said was suspicious gutted the New York office of civil rights activist Rev. Al Sharpton on Wednesday, a day after he officially entered the Democratic Party race for president. Sharpton, 48, was not in the Harlem headquarters of his National Action Network advocacy group at the time of the fire, which started at 8:30 a.m. EST and lasted about an hour, officials said. Earlier, officials said there was no reason to believe the fire had been deliberately set, but investigators who asked not to be identified later said it was suspicious. They said...